My favorite romantic film of all time is Dr. Zhivago. I’m heavily biased towards E. European/Russian themes but I still think many people will agree that it’s one of the greats. It’s long though, be ready. (Oh Laura)
If you’re feeling weary of romantic love and looking for an antidote then you should probably just go straight for the strong stuff and watch Kramer vs. Kramer. Problem solved.

If you’d rather not commit to either extreme then I suggest In the Mood for Love by Wong Kar-wai. You’ll survive it no matter where you stand; in or out of love. It’s a beautiful movie.